Will This Passport be Valid for Peru?

My 16 year old daughter is going to Peru on a charity expedition - we're not going with her. Her British child passport expires on 10 March 2011 and she'll be in Peru until 9 September.
Would we be wise to renew her passport now (making it her first adult passport) as with the unpredictable volcanic ash situation, if her return was to be delayed by a couple of days she'd fall within the 6 month expiry period?